P0686 ISUZU – Engine Control Module Power Relay Control Circuit Low

P0686 ISUZU Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P0686 ISUZU Possible Causes

Weak battery,Low voltage while cranking,Faulty Engine Control Module (ECM) power relay,ECM power relay harness is open or shorted,ECM power relay circuit poor electrical connection,Blown ECM fuse,Faulty ECM

P0686 ISUZU Description

The Engine Control Module (ECM) monitors the power inputs. The ECM sets the OBDII code when the ECM detects a low power voltage input.